Image Color Adjuster
Adjust image colors with sliders, compare each image, and export a batch.
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About this tool
Adjust brightness, contrast, saturation and warm/cool temperature in static JPG, PNG and WebP images. Drag the comparison divider, preview individual images, undo or redo, and reset adjustments. The same settings apply to the batch while original pixel dimensions are retained. PNG and WebP preserve transparency. Previews run in your browser; Python processes originals when you generate.
How to use
- Add one or more images and select a thumbnail to preview.
- Move the four adjustment sliders and compare with the divider or original/adjusted modes. Reset returns all four adjustments to zero.
- Choose PNG, JPG or WebP, generate, and follow the progress. Download images or a ZIP archive, then optionally delete server files.
Frequently asked questions
What are the default adjustments?
Zero is neutral for all four adjustments. Brightness, contrast, saturation and temperature range from -100 to 100. Positive temperature is warmer; negative is cooler. Administrators can configure initial values, while Reset always returns to neutral zero.
Do defaults change my image?
With all four values at zero, normalized pixels remain unchanged when saved as lossless PNG. EXIF orientation is applied and ICC-tagged images are converted to sRGB. Lossy JPG/WebP encoding can change pixels. Large previews are downsampled; exports retain original dimensions.
Are transparent and animated images supported?
PNG and WebP preserve alpha; JPG uses your selected background color. This tool accepts static images and rejects animations instead of silently taking their first frame.
How long are files retained?
Adjustment previews stay in page memory. Generating uploads originals and numeric settings for processing. Temporary originals and results are retained for up to 24 hours and can be deleted immediately. Reloading or leaving clears unsaved editing state.
What are the batch limits?
Deployment ceilings are 20 images, 80MB and 20 megapixels per image, 200MB and 40 megapixels per batch, and 16384 pixels per side. Administrators may lower these limits; follow the current page guidance.
Discussion & comments
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